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Home >> Hyundai >> 2013 >> Equus Ultimate >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System Diagnosis (1 Of 2) - 5.0L >> DTC P0139: O2 Sensor Circuit Slow Response (Bank 1/Sensor 2) >> General Information >> DTC Detecting Condition
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General Information: DTC Detecting Condition

Item Detecting Condition Possible cause
DTC Strategy
  • Monitor signal voltage
  1. Poor connection
  2. B1S2
  3. ECM
General Enable Conditions
  • Downstream O2S voltage before fuel cut > 0.15V
  • Fuel cut off
  • EGT around downstream O2S > 400°C (752°F)
  • Exhaust gas mass flow > 22kg/h
  • Battery voltage > 10.7V
  • 1200rpm < Engine speed < 3520rpm
Threshold Value Case1
  • Response Time > 5.0 sec

    (Duration of Downstream O2S voltage from above 0.55V to 0.15V during fuel cut off)
Case2
  • Transient Time > 0.35 sec

    (Duration of Downstream O2S voltage from 0.4V to 0.2V during fuel cut off)
MIL On Condition
  • 2 Driving Cycles
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